21685005

素因数分解:

$3^2\times 5^1\times {\mathrm{109}}^1\times {\mathrm{4421}}^1$

素因数の和:4541

約数の個数: 24

約数和(自身を含む): 37940760

約数和(自身を除く): 16255755

約数列:

[1, 3, 5, 9, 15, 45, 109, 327, 545, 981, 1635, 4421, 4905, 13263, 22105, 39789, 66315, 198945, 481889, 1445667, 2409445, 4337001, 7228335, 21685005]

約数ペア:

[(1, 21685005), (3, 7228335), (5, 4337001), (9, 2409445), (15, 1445667), (45, 481889), (109, 198945), (327, 66315), (545, 39789), (981, 22105), (1635, 13263), (4421, 4905)]